如何检测 2D 移动对象何时越过自己的路径?
我将路径存储为基于平面先前位置的点数组。
可以使用伪代码或任何编程语言来描述解决方案。
这是我已经尝试过的代码 - 它检测到完整的 360 度循环。我想我需要一种不同的方法。
CGFloat angleDiff = angleCurr - lastAngleRecorded;
lastAngleRecorded = angleCurr;
// Ensure -180 < angleDiff < 180
angleDiff = angleDiff > M_PI ? angleDiff - (M_PI*2) : angleDiff;
angleDiff = angleDiff < -M_PI ? angleDiff + (M_PI*2) : angleDiff;
// Reset tracking of the loop of the plane's angle exceeds (turns too sharply) or falls below the limits
if(fabsf(angleDiff) < angleDiffMinAllowed || fabsf(angleDiff) > angleDiffMaxAllowed) {
if(++ringFaultCount >= ringFaultCountMax) {
[self resetTracking];
return;
}
}
ringFaultCount = 0;
// Add plane position to ring polygon
[ringPoints addObject:[NSValue valueWithCGPoint: ccp(targetPlane.position.x, targetPlane.position.y)]];
// Add angleDiff to angleTotal
angleTotal += angleDiff;
// Completed loop?
if(fabsf(angleTotal) >= M_PI * 2.f) {
[self resetTracking];
if(isRingJoined){
CCLOG(@"%@ RING COMPLETE", NSStringFromSelector(_cmd));
}
return;
}